<article class="" id="post-">
<header class="entry-header">
<h1 class="entry-title">:header Selector</h1>
<div class="entry-meta">
						所属分类：<span class="category"><a href="/category/selectors/">选择器</a> &gt; <a href="/category/selectors/basic-filter-selectors/">基础过滤</a></span><span class="category-divider"> | </span><span class="category"><a href="/category/selectors/">选择器</a> &gt; <a href="/category/selectors/jquery-selector-extensions/">jQuery 扩展</a></span>
<span class="pull-right">英文文档：<a href="https://api.jquery123.com/header-selector/" target="_blank">:header Selector</a></span>
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</header><!-- .entry-header -->
<!-- .entry-header -->
<div class="entry-content">
<article class="entry selector" id="header1"><h2 class="section-title"><span>header selector</span></h2>
<div class="entry-wrapper">
<p class="desc"><strong>描述: </strong>选择所有标题元素，像h1, h2, h3 等.</p>
<ul class="signatures"><li class="signature"><h4 class="name">
<span class="version-details">添加的版本: <a href="/category/version/1.2/">1.2</a></span>jQuery( ":header" )</h4></li></ul>
<h3>Additional Notes:</h3>
<div class="longdesc"><ul>
<li>
			      因为 <code>:header()</code> 是一个 jQuery 延伸出来的一个选择器 并且不是的CSS规范的一部分, 使用<code>:header()</code>查询不能充分利用原生DOM提供的<code>querySelectorAll()</code> 方法来提高性能。为了在现代浏览器上获得更佳的性能，请使用<a href="/filter"><code>.filter(":header")</code> </a>代替。
			    </li>
</ul></div>
<section class="entry-examples" id="entry-examples"><header><h2 class="underline">例子:</h2></header><div class="entry-example" id="example-0">
<h4><span class="desc">在页面上的所有的标题元素上添加背景和文本颜色。</span></h4>
<div class="syntaxhighlighter xml ">
<table>
<tbody>
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<td class="code">
<pre><div class="container"><div class="line"><code><span class="doctype">&lt;!DOCTYPE html&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">html</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">head</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">style</span>&gt;</span><span class="css"></span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">body</span> <span class="rules">{ <span class="rule"><span class="attribute">font-size</span>:<span class="value"> <span class="number">10</span>px;</span></span> <span class="rule"><span class="attribute">font-family</span>:<span class="value"> Arial;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">h1</span>, <span class="tag">h2</span> <span class="rules">{ <span class="rule"><span class="attribute">margin</span>:<span class="value"> <span class="number">3</span>px <span class="number">0</span>;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;/<span class="title">style</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">script</span> <span class="attribute">src</span>=<span class="value">"https://code.jquery.com/jquery-latest.js"</span>&gt;</span><span class="javascript"></span><span class="tag">&lt;/<span class="title">script</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">head</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">body</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">h1</span>&gt;</span>Header 1<span class="tag">&lt;/<span class="title">h1</span>&gt;</span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">p</span>&gt;</span>Contents 1<span class="tag">&lt;/<span class="title">p</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">h2</span>&gt;</span>Header 2<span class="tag">&lt;/<span class="title">h2</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">p</span>&gt;</span>Contents 2<span class="tag">&lt;/<span class="title">p</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">script</span>&gt;</span><span class="javascript">$(<span class="string">":header"</span>).css({ background:<span class="string">'#CCC'</span>, color:<span class="string">'blue'</span> });</span><span class="tag">&lt;/<span class="title">script</span>&gt;</span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">body</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">html</span>&gt;</span></code></div></div></pre>
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</tbody>
</table>
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<h4>Demo:</h4>
<div class="demo code-demo"></div>
</div></section>
</div></article> </div>
</article>